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/*  Visualization Library                                                             */
/*  http://visualizationlibrary.org                                                   */
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/*  Copyright (c) 2005-2020, Michele Bosi                                             */
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#ifndef RenderStateSet_INCLUDE_ONCE
#define RenderStateSet_INCLUDE_ONCE

#include <vlGraphics/link_config.hpp>
#include <vlCore/Object.hpp>
#include <vlCore/vlnamespace.hpp>
#include <vlGraphics/RenderState.hpp>
#include <vector>

namespace vl
{
  class GLSLProgram;
  class RenderState;

  /** A set of RenderState objects managed by a Shader.
    * \sa Shader, Effect, Actor */
  class VLGRAPHICS_EXPORT RenderStateSet: public Object
  {
    VL_INSTRUMENT_CLASS(vl::RenderStateSet, Object)

  public:
    RenderStateSet(): mGLSLProgram(NULL)
    {
      VL_DEBUG_SET_OBJECT_NAME()
    }

    RenderStateSet& deepCopyFrom(const RenderStateSet& other);

    RenderStateSet& shallowCopyFrom(const RenderStateSet& other) { mRenderStates = other.mRenderStates; mGLSLProgram = other.mGLSLProgram; return *this; }

    // renderstates getters and setters

    void setRenderState(RenderState* renderstate, int index);

    RenderState* renderState( ERenderState type, int index=-1 );

    const RenderState* renderState( ERenderState type, int index=-1 ) const;

    size_t renderStatesCount() const { return mRenderStates.size(); }

    const RenderStateSlot* renderStates() const { if (mRenderStates.empty()) return NULL; else return &mRenderStates[0]; }

    RenderStateSlot* renderStates() { if (mRenderStates.empty()) return NULL; else return &mRenderStates[0]; }

    //! If index == -1 all the renderstates of the given type are removed regardless of their binding index.
    void eraseRenderState(ERenderState type, int index);

    void eraseAllRenderStates() { mRenderStates.clear(); mGLSLProgram = NULL; }

    //! Returns the GLSLProgram associated to a RenderStateSet (if any)
    const GLSLProgram* glslProgram() const { return mGLSLProgram; }

    //! Returns the GLSLProgram associated to a RenderStateSet (if any)
    GLSLProgram* glslProgram() { return mGLSLProgram; }

  protected:
    std::vector< RenderStateSlot > mRenderStates;
    GLSLProgram* mGLSLProgram;
  };
}

#endif